Patent GB-457432-A (GB)
Title: Improved hydraulically operated apparatus for raising and lowering implement-carrying beams on tractors
IPC: B62D49/06
Filed: 1936-04-02
Abstract: 457,432. Driving auxiliary mechanism on tractors. INTERNATIONAL HARVESTER CO., 606, South Michigan Avenue, Chicago, U.S.A.-(Assignees of Johnston, E. A. ; 112, South Michigan Avenue, Chicago, U.S.A.) April 2, 1936, No. 9813. Convention date, May 22, 1935. [Class 79 (ii)] [See also Group I] Apparatus for raising and lowering implement - carrying beams connected to a tractor comprises a source of hydraulic pressure, mounted on and actuated by the tractor and a pressureresponsive device carried on the tractor and arranged to oscillate a crank-shaft connected with the beams, the pressure - responsive device consisting of a vane arranged to oscillate in an arcuate casing mounted on the tractor. The lifting-mechanism is mounted on a plate 26 substituted for the usual plate on the housing 11 of the differential &c. gearing of the tractor. This plate 26 carries the driver's seat 15. A casing 28 forms a high-pressure fluid chamber 29 and a low-pressure chamber 38, connected, respectively, to a pump casing 31 by conduits 30, 37. The pump casing 31 is removable and is substituted for a cover-plate normally fitted over an opening at the rear of the housing 11. It includes a gear pump consisting of gears 32 driven from the power-take-off shaft 35. The pressure-responsive device consists of a vane 46 in a semicylindrical chamber 39 provided with a cover plate 40. Aligned crank-shafts 42, 43 extending through the casing 28 have enlarged end parts connected together by pins 44. The vane 46 moves in a radial slot in the end of part of the shaft 43 under the control of a spring 47. It forms a fluid-tight partition in the chamber 39. A spring-pressed and balanced rotatable valve member 50 operated by a handle 52 is provided with two arcuate recesses 56, 57. In the position shown, a passage 58 connects the recess 57 with the high-pressure chamber 29, and passages 59, 60 connect it to one end of the chamber 39, liquid on the other side of the vane 46 escaping to the low-pressure chamber 38 through passages 61, 62, the recess 56, and an opening 63. When the valve is turned through 90‹ pressure is applied to the other side of the vane 46 through the passages 58, 62, 61, and liquid escapes to the low-pressure chamber through passages 60, 59, 63. As the vane completes its stroke one or other of two conduits 66, 66<1> in the end part of the shaft 43 is brought into communication through one of two bores 67, 67<1> with a byepass opening 68 leading to the chamber 38. The vane 46 moves through more than 180‹, its movements being limited by stops 64. The crank member 69 on the outer ends of each of the shafts 42, 43 has spaced openings 70 into any one of which the crank-pin 71 fits. Lifting-links 72, 73 are pivotally connected to the pin 71 and to bellcranks 24 connected by links 25 to pivoted beams 22 carrying the implements. At the end of each stroke of the vane 46 the crankpin 71 is past its dead centre position, and it tends to be held in this position by the implements. Specification 256,583, [Class 79 (ii)], is referred to.